Wily Mo and Prince are the choices of that list.
Pena might not be the most disciplined hitter in the world, but he can hit the ball a mile. I wouldn't be expecting .300, but I think .265 and 30-35 is very realisitic. He's always I guy I've felt would break out when he finally got that everyday chance...now we'll see.
Prince has a couple good things going for him starting this year. First, he has good minor league experience. He's played at every level without skipping, and has made each jump successfully without being rushed. Furthermore, he did get 59 MLB at-bats last year to ease the transition into this year, hitting .288 with a couple dingers. Secondly, he's a power hitter with patience at the plate and the ability to hit to all fields. In 374 AAA at-bats last year, he walked 54 times, a pretty good clip. He does have some strikeout issues, which I think will make or break his average. I think he will hit for power either way, and 30 HR is not unrealistic. I'd guess I'd put projections like this:
Pessimistic -- .265/25/80
Optimistic -- .285/32/90